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/*
* Replacement for a missing asprintf and vasprintf.
*
* Provides the same functionality as the standard GNU library routines
* asprintf and vasprintf for those platforms that don't have them.
*
* The canonical version of this file is maintained in the rra-c-util package,
* which can be found at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
*
* Written by Russ Allbery <eagle@eyrie.org>
* Copyright 2006, 2015 Russ Allbery <eagle@eyrie.org>
* Copyright 2008-2009, 2011, 2013
* The Board of Trustees of the Leland Stanford Junior University
*
* Copying and distribution of this file, with or without modification, are
* permitted in any medium without royalty provided the copyright notice and
* this notice are preserved. This file is offered as-is, without any
* warranty.
*
* SPDX-License-Identifier: FSFAP
*/
#include <config.h>
#include <portable/macros.h>
#include <portable/system.h>
#include <errno.h>
/*
* If we're running the test suite, rename the functions to avoid conflicts
* with the system versions.
*/
#if TESTING
# undef asprintf
# undef vasprintf
# define asprintf test_asprintf
# define vasprintf test_vasprintf
int test_asprintf(char **, const char *, ...)
__attribute__((__format__(printf, 2, 3)));
int test_vasprintf(char **, const char *, va_list)
__attribute__((__format__(printf, 2, 0)));
#endif
int
asprintf(char **strp, const char *fmt, ...)
{
va_list args;
int status;
va_start(args, fmt);
status = vasprintf(strp, fmt, args);
va_end(args);
return status;
}
int
vasprintf(char **strp, const char *fmt, va_list args)
{
va_list args_copy;
int status, needed, oerrno;
va_copy(args_copy, args);
needed = vsnprintf(NULL, 0, fmt, args_copy);
va_end(args_copy);
if (needed < 0) {
*strp = NULL;
return needed;
}
*strp = malloc(needed + 1);
if (*strp == NULL)
return -1;
status = vsnprintf(*strp, needed + 1, fmt, args);
if (status >= 0)
return status;
else {
oerrno = errno;
free(*strp);
*strp = NULL;
errno = oerrno;
return status;
}
}
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